From the comments section:
Teen pregnancy might not be a part of your personal experience, but for many Americans it is a part of everyday life. When this video was created in 2007, 1 in 3 teenagers did indeed become pregnant by age 20. The number's shifted slightly since then and is now closer to 3 in 10. If you want to learn more about where this number comes from, our website's "Resources" section has a fact sheet about it in the "Teen Birth/ Pregnancy Data" section under the heading "Calculations."